Filter frame



FIG. 1 is a top perspective view of a filter frame of the present invention;

FIG. 2 is a top plan view of the filter frame;

FIG. 3 is a bottom plan view of the filter frame;

FIG. 4 is an elevation view showing the front and back of the filter frame;

FIG. 5 is an elevation view showing both sides of the filter frame; and,

FIG. 6 is a detailed cutaway view of the side of the filter frame showing a center ridge on the left side of FIG. 6 corresponding to the center ridge in FIG. 5 and three representative ridges on the right side of FIG. 6 corresponding to the three rightmost ridges in FIG. 5.

The dash dot lines in FIGS. 5 and 6 show center lines and form no part of the claimed design. 

CLAIM The ornamental design for a filter frame, as shown and described. 